Forced Straightening of the Back Does Not Improve Body Shape
Abstract
:1. Introduction
2. Materials and Methods
2.1. Subjects
2.2. Methods
- a.
- In a corrected, active position, without a backrest (Figure 1). The corrected position was assumed in accordance with the examiner’s instructions. Attention was paid to the complete, active, and physiological alignment of the spine in a way that required the subject to exert the least amount of effort. The activities performed included lifting the sternum, increasing the anterior pelvic tilt, positioning the head at the axis of the spine, setting the shoulder blades in a physiological position, and slightly inclining the torso [37].
- b.
- In a forced position, where the instructions were as follows: “Sit up straight, intensively pull back your shoulder blades” (Figure 2).
- c.
- In a passive, free position without a backrest or muscle involvement and with posterior pelvic tilt; this is the so-called passive position (Figure 3).
- I.
- The angular parameters of the position of the sternum body (called the α angle) and the angular parameters of the sacrum position (called the β angle) in relation to the horizontal line, constituting the sagittal axis of the body. Saunders digital inclinometer (Baseline Digital Inclinometer Range of Movement Measurement Tool, New York, NY, USA) was used to conduct the assessment. The measuring tool that was used is characterized by a high measurement accuracy. The measurement resolution is 0.1 degrees, and the measurement accuracy is ±1 degree;
- II.
- The angular parameters of the thoracic spine curves (kyphosis angle called ω1) and lumbar spine curves (lordosis angle called ω2) measured using the DIERS Formetric 4D system (DICAM 3) (Figure 4). The resolution of the device is 0.01 degrees, and the accuracy is 0.25 degrees [39]. The DIERS system uses raster stereography, so it is free from any radiation. The DIERS Formetric is a light optical visualizing system based on video raster stereography. Therefore, the system comprises a light projector that creates a line grid on the back of the patient, which is noted with an imaging unit. Computer software evaluates the line bend and creates a three-dimensional model of the surface that is analogous to a plaster cast using the method of photogrammetry.
- (a)
- Of sacral angle and sternal angle: γ = β − α;
- (b)
- Of sternal angle and thoracic kyphosis: γ1 = 180 − (α + ω1);
- (c)
- Of sternal angle and lumbar lordosis: γ2 = 180 − (β + ω2).
2.3. Statistical Analysis
3. Results
3.1. Measured Angles Based on 3 Positions
3.2. Percentage Errors
3.3. Comparison of the Angle between Groups
3.4. Correlation between Angles
3.5. Confidence Intervals
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Corrected Position | Forced Position | Passive Position | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
M (SD) | Median | Mode | Min | Max | M (SD) | Median | Mode | Min | Max | M (SD) | Median | Mode | Min | Max | |
α | 64.20 (2.44) | 64.00 | 65.00 | 60.00 | 69.70 | 70.52 (11.05) | 74.10 | 74.90 | 47.30 | 88.30 | 84.19 (11.02) | 83.20 | 91.00 | 58.20 | 111.60 |
β | 113.39 (4.98) | 113.40 | 1150 | 100.0 | 127.0 | 91.22 (8.83) | 89.70 | 87.40 | 74.10 | 125.50 | 81.64 (10.82) | 80.20 | 72.00 | 62.00 | 118.80 |
ω1 | 41.39 (4.33) | 41.73 | 41.50 | 26.46 | 49.70 | 43.41 (13.74) | 47.00 | 55.20 | 12.30 | 70.90 | 57.57 (13.34) | 59.00 | 63.30 | 20.50 | 89.00 |
ω2 | 37.68 (3.51) | 37.68 | 38.60 | 28.30 | 46.60 | 12.77 (12.31) | 11.40 | 4.30 | −15.80 | 39.90 | −5.14 (15.87) | −6.90 | −27.30 | −39.25 | 38.40 |
ϒ | 49.19 (5.38) | 49.00 | 48.00 | 34.60 | 61.30 | 20.70 (15.83) | 17.70 | −5.40 | −9.40 | 65.20 | −2.54 (17.64) | −3.30 | 1.00 | −46.70 | 44.00 |
ϒ1 | 74.41 (4.84) | 74.50 | 73.40 | 62.50 | 87.40 | 66.06 (22.60) | 63.50 | 51.00 | 27.30 | 114.80 | 38.24 (19.78) | 39.50 | 15.40 | −10.50 | 93.20 |
ϒ2 | 78.11 (4.14) | 78.10 | 77.60 | 66.00 | 88.20 | 96.70 (15.40) | 96.60 | 112.30 | 62.90 | 136.70 | 100.96 (15.59) | 101.90 | 108.8 0 | 61.80 | 139.40 |
Corrected Position | Forced Position | Passive Position | |||||||
---|---|---|---|---|---|---|---|---|---|
Me,t (°) | Me,emp (°) | Ep% (%) | Me,t (°) | Me,emp (°) | Ep% (%) | Me,t (°) | Me,emp (°) | Ep% (%) | |
ϒ | 49.19 | 49.00 | 0.40 | 20.70 | 17.70 | 16.38 | −2.54 | −3.30 | 22.22 |
ϒ1 | 74.41 | 74.50 | 0.26 | 66.06 | 63.50 | 4.92 | 38.24 | 39.50 | 3.40 |
ϒ2 | 78.11 | 78.10 | 0.12 | 96.70 | 96.60 | 0.31 | 100.96 | 101.90 | 0.99 |
Angle | Corrected Position a | Forced Position b | Passive Position c | F | p | Post Hoc |
---|---|---|---|---|---|---|
α | 64.20 ± 2.44 | 70.52 ± 11.05 | 84.19 ± 11.02 | 334.752 | 0.000 | a < b < c |
β | 113.39± 4.98 | 91.22 ± 8.83 | 81.64 ± 10.82 | 161.445 | 0.000 | a > b = c |
ω1 | 41.39 ± 4.33 | 43.41 ± 13.74 | 57.57 ± 13.34 | 965.185 | 0.000 | a < b < c |
ω2 | 37.65 ± 3.51 | 12.77 ± 12.31 | −5.14 ± 15.87 | 890.653 | 0.000 | a > b > c |
ϒ | 49.19 ± 5.38 | 20.70 ± 15.83 | −2.54 ± 17.64 | 909.821 | 0.000 | a > b > c |
ϒ1 | 74.41 ± 4.84 | 66.06 ± 22.60 | 38.24 ± 19.78 | 310.125 | 0.000 | a > b > c |
ϒ2 | 78.11 ± 4.14 | 96.70 ± 15.40 | 100.96 ± 15.59 | 237.499 | 0.000 | a < b < c |
Common Sense | Angle | Corrected Position | Forced Position | Passive Position |
---|---|---|---|---|
ϒ | α | −0.391 * | −0.843 * | −0.812 * |
β | 0.892 * | 0.737 * | 0.801 * | |
ϒ1 | α | −0.130 * | −0.890 * | −0.763 * |
ω1 | −0.134 * | −0.930 * | −0.844 * | |
ϒ2 | β | −0.210 * | −0.411 * | −0.441 * |
ω2 | −0.811 * | −0.705 * | −0.751 * |
90% CI in the Corrected Position | 90% CI in the Forced Position | 90% CI in the Passive Position | |
---|---|---|---|
α | 61.00–67.90 | 52.8–83.25 | 70.95–99.05 |
β | 107.10–119.70 | 81.12–102.60 | 68.70–96.20 |
ω1 | 35.30–46.82 | 26.10–58.56 | 39.09–73.16 |
ω2 | 32.67–42.02 | −4.32–29.92 | −24.52–17.30 |
ϒ | 42.15–56.55 | 0.68–41.88 | −26.00–20.65 |
ϒ1 | 68.04–81.06 | 38.52–98.60 | 12.35–65.17 |
ϒ2 | 72.57–83.99 | 76.42–116.55 | 79.95–120.66 |
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Kiebzak, W.P.; Ha, S.-Y.; Kosztołowicz, M.; Żurawski, A. Forced Straightening of the Back Does Not Improve Body Shape. Diagnostics 2024, 14, 250. https://doi.org/10.3390/diagnostics14030250
Kiebzak WP, Ha S-Y, Kosztołowicz M, Żurawski A. Forced Straightening of the Back Does Not Improve Body Shape. Diagnostics. 2024; 14(3):250. https://doi.org/10.3390/diagnostics14030250
Chicago/Turabian StyleKiebzak, Wojciech Piotr, Sun-Young Ha, Michał Kosztołowicz, and Arkadiusz Żurawski. 2024. "Forced Straightening of the Back Does Not Improve Body Shape" Diagnostics 14, no. 3: 250. https://doi.org/10.3390/diagnostics14030250